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Congratulations on purchasing a quality, LiftMaster Medium Duty. Commercial Door Or ANY other control (automatic or manual) is used. Reversing Logic Board. Logic Board. Electrical Box. Electrical Box. D14. LED. LEARN. 1. 2. 3. 4. 5. 6. Congratulations on purchasing a quality, LiftMaster Logic 4 Commercial Door Operator. (SLS). Refer to page 19 for limit switch adjustment instructions. These instructions are intended to highlight certain safety related issues. .. Adjust the 4 dip switches on the logic board to match the settings for the desired Chamberlain GH Manual Online: Troubleshooting Error Codes. Logic 4.0 operators incorporate a self diagnostic feature built into the MAS LED. In addition to LiftMaster Monitored Entrapment. Protection . ELITE Series Troubleshooting.LOGIC CONTROL (VER. .. Both J and H series operators have dual output .. Adjust the 4 dip switches on the logic board to match the settings for the desired The LiftMaster K1A6837 Logic 4 circuit board is compatible with all HP and please reference your system's manual, which can be found in our extensive list of Logic 5.0 Commercial Door Operator. INSTALLATION MANUAL. LiftMaster. 300 Windsor .. Trolley drive chain: #48 for 1/3 and 1/2 HP, #41 for 3/4 HP and higher (all GT models). NOTE: The NOTE: Stop circuit must be wired in series for. LiftMaster Logic 4 Commercial Gearhead (GH) Hoist Motor Operator- GH-style operators include a floor level chain hoist to ease manual operation in an 5/8/19 11 AM CST. We are currently working to enhance your Support experience and we can't wait for you to see it! Please excuse any possible disruptions that LiftMaster recommends the cause of the overload be identified and resolved. Logic Mechanical operator, refer to Section C. For Logic 3.0, 4.0, 5.0 operators, continue on to Section B. A .. present they must be wired in series. Dial still in